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<div class="title">nrf51/Board/nrf6310/ppi_example/main.c</div>  </div>
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<a href="nrf6310_2ppi__example_2main_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* Copyright (c) 2009 Nordic Semiconductor. All Rights Reserved.</span>
<a name="l00002"></a>00002 <span class="comment"> *</span>
<a name="l00003"></a>00003 <span class="comment"> * The information contained herein is confidential property of Nordic</span>
<a name="l00004"></a>00004 <span class="comment"> * Semiconductor ASA.Terms and conditions of usage are described in detail</span>
<a name="l00005"></a>00005 <span class="comment"> * in NORDIC SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.</span>
<a name="l00006"></a>00006 <span class="comment"> *</span>
<a name="l00007"></a>00007 <span class="comment"> * Licensees are granted free, non-transferable use of the information. NO</span>
<a name="l00008"></a>00008 <span class="comment"> * WARRANTY of ANY KIND is provided. This heading must NOT be removed from</span>
<a name="l00009"></a>00009 <span class="comment"> * the file.</span>
<a name="l00010"></a>00010 <span class="comment"> *</span>
<a name="l00011"></a>00011 <span class="comment"> */</span>
<a name="l00012"></a>00012 
<a name="l00054"></a>00054 <span class="preprocessor">#include &lt;stdbool.h&gt;</span>
<a name="l00055"></a>00055 <span class="preprocessor">#include &lt;stdint.h&gt;</span>
<a name="l00056"></a>00056 <span class="preprocessor">#include &quot;nrf_delay.h&quot;</span>
<a name="l00057"></a>00057 <span class="preprocessor">#include &quot;nrf_gpio.h&quot;</span>
<a name="l00058"></a>00058 
<a name="l00061"></a><a class="code" href="group__ppi__example.html#gaad16890c50156256e260b5205571ddc4">00061</a> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__ppi__example.html#gaad16890c50156256e260b5205571ddc4">ppi_init</a>(<span class="keywordtype">void</span>)
<a name="l00062"></a>00062 {
<a name="l00063"></a>00063   <span class="comment">// Power ON the PPI peripheral</span>
<a name="l00064"></a>00064   NRF_POWER-&gt;PERPOWER |= (POWER_PERPOWER_PPI_Power &lt;&lt; POWER_PERPOWER_PPI_Pos);
<a name="l00065"></a>00065 
<a name="l00066"></a>00066   <span class="comment">// Wait for the power up</span>
<a name="l00067"></a>00067   <span class="keywordflow">while</span> ((NRF_POWER-&gt;PERRDY &amp; POWER_PERRDY_PPI_Msk) != (POWER_PERRDY_PPI_Ready &lt;&lt; POWER_PERRDY_PPI_Pos))
<a name="l00068"></a>00068   {
<a name="l00069"></a>00069   }
<a name="l00070"></a>00070 
<a name="l00071"></a>00071   <span class="comment">// Configure PPI channel 0 to stop Timer0 counter at TIMER1 COMPARE[0] match, which is every even number of seconds</span>
<a name="l00072"></a>00072   NRF_PPI-&gt;CH0_EEP = (uint32_t)(&amp;NRF_TIMER1-&gt;EVENTS_COMPARE[0]);
<a name="l00073"></a>00073   NRF_PPI-&gt;CH0_TEP = (uint32_t)(&amp;NRF_TIMER0-&gt;TASKS_STOP);
<a name="l00074"></a>00074 
<a name="l00075"></a>00075   <span class="comment">// Configure PPI channel 1 to start timer0 counter at TIMER2 COMPARE[0] match, which is every odd number of seconds</span>
<a name="l00076"></a>00076   NRF_PPI-&gt;CH1_EEP = (uint32_t)(&amp;NRF_TIMER2-&gt;EVENTS_COMPARE[0]);
<a name="l00077"></a>00077   NRF_PPI-&gt;CH1_TEP = (uint32_t)(&amp;NRF_TIMER0-&gt;TASKS_START);
<a name="l00078"></a>00078 
<a name="l00079"></a>00079   <span class="comment">// Enable only PPI channels 0 and 1</span>
<a name="l00080"></a>00080   NRF_PPI-&gt;CHEN = (PPI_CHEN_CH0_Enabled &lt;&lt; PPI_CHEN_CH0_Pos) | (PPI_CHEN_CH1_Enabled &lt;&lt; PPI_CHEN_CH1_Pos);
<a name="l00081"></a>00081 }
<a name="l00082"></a>00082 
<a name="l00085"></a><a class="code" href="group__ppi__example.html#gadd186346e02f7413d2fa6e72fe5f9562">00085</a> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__ppi__example.html#gadd186346e02f7413d2fa6e72fe5f9562">timer0_init</a>(<span class="keywordtype">void</span>)
<a name="l00086"></a>00086 {
<a name="l00087"></a>00087   <span class="comment">// Start to power up TIMER0 peripheral</span>
<a name="l00088"></a>00088   NRF_POWER-&gt;PERPOWER |= (POWER_PERPOWER_TIMER0_Power &lt;&lt; POWER_PERPOWER_TIMER0_Pos);
<a name="l00089"></a>00089 
<a name="l00090"></a>00090   <span class="comment">// Wait for it power up</span>
<a name="l00091"></a>00091   <span class="keywordflow">while</span> ((NRF_POWER-&gt;PERRDY &amp; POWER_PERRDY_TIMER0_Msk) != (POWER_PERRDY_TIMER0_Ready &lt;&lt; POWER_PERRDY_TIMER0_Pos))
<a name="l00092"></a>00092   {
<a name="l00093"></a>00093   }
<a name="l00094"></a>00094 
<a name="l00095"></a>00095   NRF_TIMER0-&gt;MODE = TIMER_MODE_MODE_Counter; <span class="comment">// Set the timer in counter Mode</span>
<a name="l00096"></a>00096 }
<a name="l00097"></a>00097 
<a name="l00103"></a><a class="code" href="group__ppi__example.html#ga43132496bef9b695b89b05793586aa27">00103</a> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__ppi__example.html#ga43132496bef9b695b89b05793586aa27">timer1_init</a>(<span class="keywordtype">void</span>)
<a name="l00104"></a>00104 {
<a name="l00105"></a>00105   <span class="comment">// Power on the TIMER1 peripheral</span>
<a name="l00106"></a>00106   NRF_POWER-&gt;PERPOWER |= (POWER_PERPOWER_TIMER1_Power &lt;&lt; POWER_PERPOWER_TIMER1_Pos);
<a name="l00107"></a>00107 
<a name="l00108"></a>00108   <span class="comment">// Wait for the power up</span>
<a name="l00109"></a>00109   <span class="keywordflow">while</span> ((NRF_POWER-&gt;PERRDY &amp; POWER_PERRDY_TIMER1_Msk) != (POWER_PERRDY_TIMER1_Ready &lt;&lt; POWER_PERRDY_TIMER1_Pos))
<a name="l00110"></a>00110   {
<a name="l00111"></a>00111   }
<a name="l00112"></a>00112 
<a name="l00113"></a>00113   <span class="comment">// Configure timer1 to overflow every 2 seconds</span>
<a name="l00114"></a>00114   <span class="comment">// SysClk = 16Mhz</span>
<a name="l00115"></a>00115   <span class="comment">// BITMODE = 16 bit</span>
<a name="l00116"></a>00116   <span class="comment">// PRESCALER = 9</span>
<a name="l00117"></a>00117   <span class="comment">// now the overflow occurs every 0xFFFF/(SysClk/2^PRESCALER)</span>
<a name="l00118"></a>00118   <span class="comment">// = 65535/31250 = 2.097 seconds</span>
<a name="l00119"></a>00119   NRF_TIMER1-&gt;BITMODE = (TIMER_BITMODE_BITMODE_16Bit &lt;&lt; TIMER_BITMODE_BITMODE_Pos);
<a name="l00120"></a>00120   NRF_TIMER1-&gt;PRESCALER = 9;
<a name="l00121"></a>00121   NRF_TIMER1-&gt;SHORTS = (TIMER_SHORTS_COMPARE0_CLEAR_Enabled &lt;&lt; TIMER_SHORTS_COMPARE0_CLEAR_Pos);
<a name="l00122"></a>00122 
<a name="l00123"></a>00123   <span class="comment">// Trigger interrupt for compare[0] event</span>
<a name="l00124"></a>00124   NRF_TIMER1-&gt;MODE = TIMER_MODE_MODE_Timer;
<a name="l00125"></a>00125   NRF_TIMER1-&gt;CC[0] = 0xFFFFUL;  <span class="comment">// match at even number of seconds</span>
<a name="l00126"></a>00126 }
<a name="l00127"></a>00127 
<a name="l00133"></a><a class="code" href="group__ppi__example.html#ga9459bbd9d6c1f423f968799c09f96434">00133</a> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="group__ppi__example.html#ga9459bbd9d6c1f423f968799c09f96434">timer2_init</a>(<span class="keywordtype">void</span>)
<a name="l00134"></a>00134 {
<a name="l00135"></a>00135   <span class="comment">// Start to power up TIMER2 peripheral</span>
<a name="l00136"></a>00136   NRF_POWER-&gt;PERPOWER |= (POWER_PERPOWER_TIMER2_Power &lt;&lt; POWER_PERPOWER_TIMER2_Pos);
<a name="l00137"></a>00137 
<a name="l00138"></a>00138   <span class="comment">// Wait for TIMER21 to power up</span>
<a name="l00139"></a>00139   <span class="keywordflow">while</span> ((NRF_POWER-&gt;PERRDY &amp; POWER_PERRDY_TIMER2_Msk) != (POWER_PERRDY_TIMER2_Ready &lt;&lt; POWER_PERRDY_TIMER2_Pos))
<a name="l00140"></a>00140   {
<a name="l00141"></a>00141   }
<a name="l00142"></a>00142 
<a name="l00143"></a>00143   <span class="comment">// generate interrupt/event when half time before timer overflows, that is at 1,3,5,7,... so on secs from start</span>
<a name="l00144"></a>00144   <span class="comment">// SysClk = 16Mhz</span>
<a name="l00145"></a>00145   <span class="comment">// BITMODE = 16 bit</span>
<a name="l00146"></a>00146   <span class="comment">// PRESCALER = 9</span>
<a name="l00147"></a>00147   <span class="comment">// now the overflow occurs every 0xFFFF/(SysClk/2^PRESCALER)</span>
<a name="l00148"></a>00148   <span class="comment">// = 65535/31250 = 2.097 seconds */</span>
<a name="l00149"></a>00149   NRF_TIMER2-&gt;BITMODE = (TIMER_BITMODE_BITMODE_16Bit &lt;&lt; TIMER_BITMODE_BITMODE_Pos);
<a name="l00150"></a>00150   NRF_TIMER2-&gt;PRESCALER = 9;
<a name="l00151"></a>00151   NRF_TIMER2-&gt;SHORTS = (TIMER_SHORTS_COMPARE0_CLEAR_Enabled &lt;&lt; TIMER_SHORTS_COMPARE0_CLEAR_Pos);
<a name="l00152"></a>00152 
<a name="l00153"></a>00153 
<a name="l00154"></a>00154   <span class="comment">// Trigger interrupt for compare[0] event</span>
<a name="l00155"></a>00155   NRF_TIMER2-&gt;MODE = TIMER_MODE_MODE_Timer;
<a name="l00156"></a>00156   NRF_TIMER2-&gt;CC[0] = 0x8FFFUL;  <span class="comment">// match at odd number of seconds</span>
<a name="l00157"></a>00157 }
<a name="l00162"></a><a class="code" href="group__ppi__example.html#ga840291bc02cba5474a4cb46a9b9566fe">00162</a> <span class="keywordtype">int</span> <a class="code" href="group__gpio__example.html#ga840291bc02cba5474a4cb46a9b9566fe">main</a>(<span class="keywordtype">void</span>)
<a name="l00163"></a>00163 {
<a name="l00164"></a>00164   <a class="code" href="group__ppi__example.html#gadd186346e02f7413d2fa6e72fe5f9562">timer0_init</a>();  <span class="comment">// timer whose value is used to blink LEDs</span>
<a name="l00165"></a>00165   <a class="code" href="group__ppi__example.html#ga43132496bef9b695b89b05793586aa27">timer1_init</a>();  <span class="comment">// using timer to generate events even number of seconds</span>
<a name="l00166"></a>00166   <a class="code" href="group__ppi__example.html#ga9459bbd9d6c1f423f968799c09f96434">timer2_init</a>();  <span class="comment">// using timer to generate events odd number of seconds</span>
<a name="l00167"></a>00167   <a class="code" href="group__ppi__example.html#gaad16890c50156256e260b5205571ddc4">ppi_init</a>();     <span class="comment">// use ppi to redirect the event to timer start/stop tasks</span>
<a name="l00168"></a>00168 
<a name="l00169"></a>00169   <span class="comment">// Start clock</span>
<a name="l00170"></a>00170   NRF_TIMER1-&gt;TASKS_START = 1;
<a name="l00171"></a>00171   NRF_TIMER2-&gt;TASKS_START = 1;
<a name="l00172"></a>00172 
<a name="l00173"></a>00173   <span class="comment">// Configure pins 8-15 as outputs</span>
<a name="l00174"></a>00174   <a class="code" href="group__nrf__gpio.html#ga08c820bf0360c7406b64ddaf3bfc7222" title="Configure GPIO pin range as outputs with normal drive strength. This function can be used to configur...">nrf_gpio_range_cfg_output</a>(8, 15);
<a name="l00175"></a>00175 
<a name="l00176"></a>00176   <span class="comment">// loop, increment the timer count value and capture value into LEDs. Note counter is only incremented between TASK_START and TASK_STOP</span>
<a name="l00177"></a>00177   <span class="keywordflow">while</span> (<span class="keyword">true</span>)
<a name="l00178"></a>00178   {
<a name="l00179"></a>00179     <span class="comment">/* increment the counter */</span>
<a name="l00180"></a>00180     NRF_TIMER0-&gt;TASKS_COUNT = 1;
<a name="l00181"></a>00181     NRF_TIMER0-&gt;TASKS_CAPTURE[0] = 1;
<a name="l00182"></a>00182 
<a name="l00183"></a>00183     <a class="code" href="group__nrf__gpio.html#gac1d4940bc5ad4aad4f6363c7021b08ae" title="Write GPIO port.">nrf_gpio_port_write</a>(<a class="code" href="group__nrf__gpio.html#ggaa1a5c145e334817f2d960317d64fcb3da9209d7820d65eb58c7804e676581bf40" title="Port 1 (GPIO pin 8-15)">NRF_GPIO_PORT_SELECT_PORT1</a>, (uint8_t)NRF_TIMER0-&gt;CC[0]);
<a name="l00184"></a>00184 
<a name="l00185"></a>00185     nrf_delay_ms(100);
<a name="l00186"></a>00186   }
<a name="l00187"></a>00187 }
<a name="l00188"></a>00188 
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